manifest validator - SERP Analysis

https://redirection.io/tools/web-app-manifest/validator

https://learn.microsoft.com/en-us/office/dev/add-ins/testing/troubleshoot-manifest

https://www.validbot.com/tools/app-manifest-wizard.php

https://www.movielabs.com/md/validator/

https://dev.overwolf.com/ow-native/reference/manifest/validate-your-manifest-json/

https://www.movielabs.com/md/manifest/validator/v1.4/

https://dashif.org/tools/validators/

https://iiif.io/api/presentation/validator/service/

https://manifesttester.com/

https://discourse.mozilla.org/t/manifest-v3-validation-tools/102915